US5635025A - Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute - Google Patents

Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute Download PDF

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Publication number
US5635025A
US5635025A US08/354,005 US35400594A US5635025A US 5635025 A US5635025 A US 5635025A US 35400594 A US35400594 A US 35400594A US 5635025 A US5635025 A US 5635025A
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United States
Prior art keywords
vessel
level
digester
recited
liquid
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Expired - Fee Related
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US08/354,005
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English (en)
Inventor
Victor L. Bilodeau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ahlstrom Machinery Inc
Kamyr Inc
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Ahlstrom Machinery Inc
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Filing date
Publication date
Application filed by Ahlstrom Machinery Inc filed Critical Ahlstrom Machinery Inc
Priority to US08/354,005 priority Critical patent/US5635025A/en
Assigned to KAMYR, INC. reassignment KAMYR, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BILODEAU, VICTOR L.
Priority to CA002181786A priority patent/CA2181786C/fr
Priority to JP8517642A priority patent/JP2889703B2/ja
Priority to PCT/US1995/015458 priority patent/WO1996017995A1/fr
Priority to FI963001A priority patent/FI963001A/fi
Priority to SE9602919A priority patent/SE518292C2/sv
Application granted granted Critical
Publication of US5635025A publication Critical patent/US5635025A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/24—Continuous processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/12—Devices for regulating or controlling

Definitions

  • the material In the pulping of comminuted cellulosic fibrous material, such as wood chips, in a continuous or batch digester the material is treated to remove entrapped air and to impregnate the material with cooking liquor while raising its pressure and temperature (e.g. to 150° C. and 165 psi).
  • the chips are steamed to purge them of air while simultaneously increasing their temperature, passed through air locks to raise their pressure, impregnated with heated cooking liquor, and then transported as a slurry to the digester.
  • an apparatus in order to accommodate the purging, heating, pressurizing, and feeding functions, an apparatus is provided that is bulky, tall, and expensive. Normally a special building or super structure must be built to house or support this equipment. Such a building or super structure is built with structural steel and concrete, requires utilities, stairwells, and other accouterments, and contributes greatly to the cost of a continuous digester system. Also, the cost of the conveyor which transports chips to the inlet to the system is highly dependent upon the overall height of the system, which is typically on the order of about 115 feet for a digester which has a capacity of about 1,500 tons per day.
  • a single generally vertical vessel having a top and a bottom, which performs the functions of a conventional chip bin, steaming vessel, and chip chute into a single vessel, typically smaller than the combined sizes of the other vessels (e.g., typically at least 20% smaller than the combined sizes), which results in a significant decrease in the cost of constructing and operating a chip feed system for a continuous digester.
  • the single vessel according to the invention is larger than corresponding prior art vessels, because of its simplicity, it is easier to construct, operate and maintain.
  • a method of handling comminuted cellulosic fibrous material is provided to feed the material to a continuous or batch digester.
  • the method comprises the steps of: (a) Confining comminuted cellulosic fibrous material in a predetermined, open, volume. (b) In the predetermined volume, establishing a first level of comminuted cellulosic fibrous material, and a second level, below the first level, of cooking liquor. (c) Subjecting the comminuted cellulosic fibrous material between the first and second levels to steam to effect steaming of the comminuted cellulosic fibrous material in the predetermined volume.
  • steps (a)-(e) are practiced substantially so continuously, comminuted cellulosic fibrous material being substantially continuously introduced into the predetermined volume from above the first level, substantially continuously flowing downwardly in the predetermined volume, and being substantially continuously removed from the predetermined volume below the second level.
  • steps (a)-(e) may also be practiced at superatmospheric pressure (e,g. about 0.1-4 bar).
  • the slurry from step (e) may be fed directly to the top of a digester, or through an impregnation vessel.
  • a digester system comprising the following components: A continuous digester.
  • a high pressure transfer device for transferring comminuted cellulosic fibrous material slurry under pressure to the continuous digester.
  • a generally cylindrical vertically oriented vessel having a top and a bottom.
  • Metering means for feeding comminuted cellulosic fibrous material into the vessel from the top thereof.
  • the withdrawing means may comprise a combination of a metering screw feeder, or any type of conventional metering conveyor, and a low pressure pump, while the metering means may comprise a conventional chip meter such as sold by Kamyr, Inc. of Glens Falls, N.Y., a screw conveyor, or any other type of conventional metering conveyor.
  • the vessel may include, between the second level and the bottom of the vessel, a single convergence type configuration providing a reduced cross sectional area of more than 50% compared to the cross sectional area at the second level.
  • a pressure isolation device is preferably provided between the metering means and the vessel to control the vessel pressure.
  • the vessel may be operated pressurized or unpressurized.
  • an upright vessel having a top and a bottom.
  • the vessel takes the place of a conventional chip bin, steaming vessel and chip chute in a conventional system for feeding chips or like comminuted cellulosic fibrous material to a continuous digester, and preferably has a size of at least 20% less than the combined sizes of the conventional chip bin, steaming vessel and chip chute, and preferably is at least 50% smaller in size. Regardless of size, the vessel is less complex, making it easier to construct, operate and maintain.
  • the vessel comprises: A first conduit for supplying steam to the vessel.
  • a temperature controller for sensing the temperature within the vessel and controlling the first valve at least partially in response thereto.
  • a second conduit for supplying liquid to the vessel.
  • a second automatically controlled valve associated with the second conduit A level controller for sensing the level of liquid within the vessel and controlling the second valve at least partially in response thereto.
  • Metering means for feeding comminuted cellulosic fibrous material into the vessel from the top thereof. And means for withdrawing a slurry of comminuted cellulosic fibrous material in liquid from adjacent the bottom of the vessel.
  • a method of simplifying the chip feed system of a continuous digester having a high pressure transfer device comprising steps of: (a) Removing the conventional chip bin, steaming vessel and chip chute from operative connection to the high pressure transfer device. (b) Replacing the chip bin, steaming vessel and chip chute with a single vertical vessel having steaming means and chip slurrying means associated therewith and having an outlet from the bottom thereof, the single vertical vessel preferably having a volume at least 20% less than the combined volumes of the chip bin, steaming vessel, and chip chute. And (c) connecting the outlet from the bottom of the single vertical vessel to the high pressure transfer device.
  • the invention also relates to a chips steam and feeding device for feeding steamed chips to a batch digester in an effective and simplified manner.
  • FIG. 1 is a side schematic view of an exemplary apparatus according to the invention for practicing exemplary methods according to the present invention.
  • FIG. 2 is a schematic view illustrating the feeding of steamed chips from the apparatus of FIG. 1 to a plurality of batch digesters.
  • a single vessel 11 in a simplified feed system 10 is provided.
  • the vessel 11 is generally vertically oriented and has a top and a bottom, and may be smaller than the combined sizes of the conventional chip chute, steaming vessel and chip bin, e.g., having a size that is at least 20% less than the combined sizes of those conventional vessels, and preferably even at least 50% less in size. In any event, it is simple, being easy to construct, operate and maintain.
  • the vessel 11 is fed with wood chips, or like comminuted cellulosic fibrous material, utilizing a metering means 12.
  • the metering means 12 may be a conventional chip meter as sold by Kamyr, Inc. of Glens Falls, N.Y. or it may be any type of conveyor that can be used to control the flow of chips into the system, for example a screw conveyor.
  • the hopper or vessel 11 may include conventional devices for venting gases and controlling the pressure and vacuum within the vessel.
  • the pressure/vacuum relief gate disclosed in copending application "Reducing Gaseous Emission from a Chip bin" Ser. No. 08,317,801 filed on Oct. 4, 1994 (Attorney Reference 10-1005), the disclosure of which is hereby incorporated by reference herein, may be used.
  • the metered chip flow into vessel 11 establishes a chip level 13, which is conventionally monitored by a gamma radiation system including gamma radiation sources 14, and a radiation detector 15, providing a means for establishing the first, chips, level 13 in vessel 11.
  • Steam from steam source 16 is added to the vessel 11 via conduit 17 and steam header 18.
  • a typical steam addition point is shown in FIG. 1, however, steam may be added at other points or at different points if necessary or desirable. Normally the steam is added below level 13 and where the chips are open (i.e. not covered by liquid).
  • control valve 19 which is in turn automatically controlled by the conventional temperature-indicator-controller 20.
  • Controller 20 receives a chip temperature signal from temperature probe 21 and at least in part controls automatic valve 19 in response thereto.
  • the temperature control may be as disclosed in said PCT Publication No. WO 96/10674.
  • the chips After steaming, the chips are immersed and impregnated in cooking liquor, for example, kraft black liquor, white liquor, green liquor, or sulfite cooking liquor, at the liquor level 22.
  • cooking liquor for example, kraft black liquor, white liquor, green liquor, or sulfite cooking liquor
  • This second liquor, level 22 is controlled by conventional level-indicator-controller 23 which controls (at least in part) second control valve 24 while monitoring the liquor level via level indicator 25, the valve 24 connected to the in-line drainer 39.
  • Mother valve 44 leading from drainer 39 back to vessel 11 is controlled by a conventional flow control system 45.
  • transition 26 which reduces the cross-sectional area of the vessel 11 by more than 50%, so at the vessel 11 bottom the low pressure pump 28 can be fed.
  • This transition 26 may be of single-convergence type sold under the trademark Diamondback Hopper® by J. R. Johnson of San Luis Obispo, Calif., and as shown in U.S. Pat. No. 4,958,741, or two or more of these types of hoppers may be used.
  • This transition 26 may also be a "chisel-type" hopper, such as shown in copending application Ser. No. 08/189,546 filed Feb. 1, 1994.
  • a screw 52 powered by an electric motor 51, transfers a metered flow of slurry to the inlet of the pump 28.
  • the motor 51 is preferably a variable speed motor.
  • the screw 52 may be replaced by any suitable metering device that seprates the pump 28 from the vessel 11 so that the weight of chip mass on the pump inlet does not hinder its operation. That is any suitable chip flow restrictor, such as a conveyor, rotating table, or the like, may be used as the metering device in place of screw 52.
  • the pump 28 transfers the steamed and impregnated chip and liquor slurry from the bottom of the hopper to a conventional high pressure transfer device 30, via conduit 29.
  • the pump 28 is typically a conventional slurry pump.
  • the high pressure transfer device 30 is typically a conventional high pressure feeder as supplied by Kamyr, Inc., and such as generally shown in U.S. Pat. No. 4,372,711.
  • the high pressure feeder 30 shown typically has a low pressure inlet 31 and a low pressure outlet 32, a high pressure inlet 33 and a high pressure outlet 34.
  • the chips and liquor passed to the feeder 33 via conduit 31 are substantially separated in the feeder. Substantially all the chips are transported out of the high pressure outlet 34 by means of high pressure pump 35 and pass under pressure to a continuous digester or impregnation vessel 41 via conduit 36.
  • the liquor not passed via conduit 36 exits the feeder 30 through low pressure outlet 32. This liquor is returned to the vessel 11 by conduit 37, sand separator 38, in-line drainer 39, control valve 44, and distribution header 40.
  • the vessel 11 may also operate under superatmospheric conditions.
  • an additional pressure isolating device 42 such as shown in U.S. Pat. No. 5,500,083, may be located between the chip meter 12 and hopper 11.
  • One typical device that could be used as device 42 is a low pressure feeder sold by Kamyr, Inc., though any available pressure isolating device may be used.
  • an additional pump 43 may be required to return liquor from the high pressure transfer device 30 to the pressurized vessel 11.
  • the superatmospheric pressure maintained in vessel 11 is typically about 0.1-4 bar, e.g., 2-4 bar.
  • the steam source 16 may be any available steam source in the mill.
  • the steam may be fresh steam in line 50. Since steam produced from flashed cooking liquor can contain undesirable total reduced sulfur (TRS) gases which must be collected and destroyed if introduced into the hopper, fresh steam is preferred.
  • TRS total reduced sulfur
  • FIG. 2 illustrates use of the pump 28 from FIG. 1 to feed one or more batch digesters 54.
  • a distribution valve 55 is preferably provided to control flow from pump 28 (which is usually substantially continuous) to digester 54.
  • a storage vessel may also be provided, especially if only a single digester 54 is used, or pump 28 and vessel 11 operation may be discontinuous.

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US08/354,005 1994-12-05 1994-12-05 Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute Expired - Fee Related US5635025A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US08/354,005 US5635025A (en) 1994-12-05 1994-12-05 Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute
CA002181786A CA2181786C (fr) 1994-12-05 1995-11-28 Dispositif d'alimentation en copeaux ameliore et procede concernant un digesteur/lessiveur
JP8517642A JP2889703B2 (ja) 1994-12-05 1995-11-28 蒸解カンに対する、改良されたチップ供給システムおよび装置
PCT/US1995/015458 WO1996017995A1 (fr) 1994-12-05 1995-11-28 Dispositif d'alimentation en copeaux ameliore et procede concernant un digesteur/lessiveur
FI963001A FI963001A (fi) 1994-12-05 1996-07-29 Parannettu hakkeensyöttöjärjestelmä ja -menetelmä keittimelle
SE9602919A SE518292C2 (sv) 1994-12-05 1996-08-05 Metod för matning av flis till en kokare

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/354,005 US5635025A (en) 1994-12-05 1994-12-05 Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute

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US5635025A true US5635025A (en) 1997-06-03

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US (1) US5635025A (fr)
JP (1) JP2889703B2 (fr)
CA (1) CA2181786C (fr)
FI (1) FI963001A (fr)
SE (1) SE518292C2 (fr)
WO (1) WO1996017995A1 (fr)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020827A1 (fr) * 1997-10-16 1999-04-29 Kvaerner Pulping Ab Systeme fonctionnel et procede destine au traitement preliminaire d'une matiere desintegree contenant de la cellulose avant cuisson
US6084712A (en) * 1998-11-03 2000-07-04 Dynamic Measurement And Inspection,Llc Three dimensional imaging using a refractive optic design
US6199299B1 (en) 1998-04-06 2001-03-13 Andritz-Ahlstrom Inc. Feeding of comminuted fibrous material to a pulping process
WO2001049927A1 (fr) * 1999-12-29 2001-07-12 Kvaerner Pulping Ab Procede permettant de commander la temperature de cuisson d'un digesteur a phase vapeur continue
US6284095B1 (en) 1999-02-04 2001-09-04 Andritz-Ahlstrom Inc. Minimization of malodorous gas release from a cellulose pulp mill feed system
US6336573B1 (en) 1998-04-06 2002-01-08 Andritz-Ahlstrom Inc. Hopper, or bin, screw feeder construction controlling discharge velocity profile
US6368453B1 (en) 1999-03-18 2002-04-09 Andritz Inc. Chip feeding to a comminuted cellulosic fibrous material treatment vessel
US6432264B2 (en) * 1998-05-29 2002-08-13 Andritz Inc. Method of making a vessel assembly for handling comminuted cellulosic fibrous material
US6436233B1 (en) 2000-05-18 2002-08-20 Andritz Inc. Feeding cellulose material to a treatment vessel
US6451172B1 (en) 2000-05-18 2002-09-17 Andritz Inc. In-line drainer enhancements
US6468006B1 (en) 1999-05-11 2002-10-22 Andritz, Inc. High pressure feeder having restriction ramp in high pressure inlet
US20020185176A1 (en) * 2001-05-18 2002-12-12 Leavitt Aaron T. Pressure vessel for a pulp mill having overflow chute
US6551462B2 (en) * 1996-10-25 2003-04-22 Andritz Inc. System for feeding comminuted fibrous material
US20030215293A1 (en) * 1999-05-11 2003-11-20 Andritz Inc. High pressure feeder having smooth pocket in rotor
WO2003106765A1 (fr) 2001-12-17 2003-12-24 Kvaerner Pulping Ab Procede et systeme d'impregnation de copeaux
US20050279468A1 (en) * 2004-06-22 2005-12-22 Andritz Inc. Method and system for feeding cellulose chips to a high pressure continuous cooking system
WO2006006934A1 (fr) * 2004-07-15 2006-01-19 Kvaerner Pulping Ab Procede et dispositif d'impregnation de copeaux
US20060037723A1 (en) * 2002-03-15 2006-02-23 Lennart Gustavsson Method for the feed of cellulose chips during the continuous cooking of cellulose
US20060191652A1 (en) * 2003-04-17 2006-08-31 Vidar Snekkenes Steam treatment of chips with the addition of an acid liquid
US20070227682A1 (en) * 2004-05-05 2007-10-04 Metso Paper, Inc. Method and a Device for Removing Gas from Wood Chips
US20090090477A1 (en) * 2005-09-27 2009-04-09 Metso Paper, Inc. Feeder
US20090158664A1 (en) * 2007-12-20 2009-06-25 Jyung-Hoon Kim Rotary apparatus for use with a gasifier system and methods of using the same
US20100051222A1 (en) * 2008-08-27 2010-03-04 Andre Turqueti Continuous digester system
US20100314055A1 (en) * 2009-06-11 2010-12-16 Andritz Inc. Compact feed system and method for comminuted cellulosic material
US20110002759A1 (en) * 2007-08-01 2011-01-06 Tetsuro Murayama Method and apparatus for forcing gas-solid two-phase substance
WO2011021968A1 (fr) 2009-08-19 2011-02-24 Metso Fiber Karlstad Ab Procédé et agencement pour ajouter des lessives de traitement à du matériau de cellulose brut dans un processus continu en utilisant des cuves à courant descendant
WO2011053203A1 (fr) * 2009-10-28 2011-05-05 Metso Paper Sweden Ab Procédé et dispositif de traitement à la vapeur et d'imprégnation de copeaux de bois dans une cuve à écoulement descendant
US20150160005A1 (en) * 2012-06-12 2015-06-11 Shima Seiki Mfg., Ltd. Three-dimensional measurement apparatus, and three-dimensional measurement method
EP3054051A1 (fr) 2015-02-09 2016-08-10 BETA RENEWABLES S.p.A. Procédé pour transférer une charge d'alimentation lignocellulosique
EP3054052A1 (fr) 2015-02-09 2016-08-10 BETA RENEWABLES S.p.A. Procédé amélioré de transfert d'une matière première ligno-cellulosique
EP3054050A1 (fr) 2015-02-09 2016-08-10 BETA RENEWABLES S.p.A. Procédé de prétraitement d'une charge d'alimentation lignocellulosique

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SE0702644L (sv) * 2007-11-30 2008-08-26 Metso Fiber Karlstad Ab Anordning och förfarande för kontinuerlig basning av flis vid tillverkning av cellulosamassa
US20090188641A1 (en) * 2008-01-30 2009-07-30 Andritz Inc. Method and system for measuring and controlling digester or impregnation vessel chip level by measuring chip pressure
SE532083C2 (sv) * 2008-03-20 2009-10-20 Metso Fiber Karlstad Ab Matningssystem innefattande parallella pumpar för en kontinuerlig kokare
MX2012005924A (es) * 2009-11-24 2012-06-13 Andritz Inc Metodo y sistema para coccion con digestor de virutas delgadas.

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Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6551462B2 (en) * 1996-10-25 2003-04-22 Andritz Inc. System for feeding comminuted fibrous material
WO1999020827A1 (fr) * 1997-10-16 1999-04-29 Kvaerner Pulping Ab Systeme fonctionnel et procede destine au traitement preliminaire d'une matiere desintegree contenant de la cellulose avant cuisson
US6280567B1 (en) * 1997-10-16 2001-08-28 Kvaerner Pulping Ab System and method for treatment of cellulose-containing material prior to pulp digestion
US6199299B1 (en) 1998-04-06 2001-03-13 Andritz-Ahlstrom Inc. Feeding of comminuted fibrous material to a pulping process
US6336573B1 (en) 1998-04-06 2002-01-08 Andritz-Ahlstrom Inc. Hopper, or bin, screw feeder construction controlling discharge velocity profile
US6432264B2 (en) * 1998-05-29 2002-08-13 Andritz Inc. Method of making a vessel assembly for handling comminuted cellulosic fibrous material
US6084712A (en) * 1998-11-03 2000-07-04 Dynamic Measurement And Inspection,Llc Three dimensional imaging using a refractive optic design
US6375795B2 (en) 1999-02-04 2002-04-23 Andritz-Ahlstrom Inc. Minimization of malodorous gas release from a cellulose pulp mill feed system
US6284095B1 (en) 1999-02-04 2001-09-04 Andritz-Ahlstrom Inc. Minimization of malodorous gas release from a cellulose pulp mill feed system
US6368453B1 (en) 1999-03-18 2002-04-09 Andritz Inc. Chip feeding to a comminuted cellulosic fibrous material treatment vessel
US20030089468A1 (en) * 1999-03-18 2003-05-15 Andritz Inc. Chip feeding to a comminuted cellulosic fibrous material treatment vessel
US20030231933A1 (en) * 1999-05-11 2003-12-18 Andritz Inc. High pressure feeder having smooth pocket in rotor
US20030215293A1 (en) * 1999-05-11 2003-11-20 Andritz Inc. High pressure feeder having smooth pocket in rotor
US6616384B2 (en) 1999-05-11 2003-09-09 Andritz, Inc. High pressure feeder having smooth pocket in rotor
US6468006B1 (en) 1999-05-11 2002-10-22 Andritz, Inc. High pressure feeder having restriction ramp in high pressure inlet
US6669410B2 (en) 1999-05-11 2003-12-30 Andritz Inc. High pressure feeder having smooth pocket in rotor
WO2001049927A1 (fr) * 1999-12-29 2001-07-12 Kvaerner Pulping Ab Procede permettant de commander la temperature de cuisson d'un digesteur a phase vapeur continue
US20030000660A1 (en) * 1999-12-29 2003-01-02 Lennart Gustavsson Method for controlling the cooking temperature in a continuous vapour phase digester
US6843885B2 (en) * 1999-12-29 2005-01-18 Kvaerner Pulping Ab Method for controlling the cooking temperature in a continuous vapour phase digester
US6451172B1 (en) 2000-05-18 2002-09-17 Andritz Inc. In-line drainer enhancements
US6447645B1 (en) * 2000-05-18 2002-09-10 Andritz Inc. Feeding cellulose material to a treatment vessel
US6436233B1 (en) 2000-05-18 2002-08-20 Andritz Inc. Feeding cellulose material to a treatment vessel
US20020185176A1 (en) * 2001-05-18 2002-12-12 Leavitt Aaron T. Pressure vessel for a pulp mill having overflow chute
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CA2181786A1 (fr) 1996-06-13
SE9602919D0 (sv) 1996-08-05
JPH09509231A (ja) 1997-09-16
FI963001A0 (fi) 1996-07-29
CA2181786C (fr) 2001-07-24
SE518292C2 (sv) 2002-09-17
FI963001A (fi) 1996-08-29
WO1996017995A1 (fr) 1996-06-13
SE9602919L (sv) 1996-08-05
JP2889703B2 (ja) 1999-05-10

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